Acetylene-blowpipe.



l. W. & E. H. SMITH.

ACETYLENE BLOWPIPE.

APPucATloN min 1AN.1o. 1913.

1,136,492. Patented Apr.2o,1915

TTR

UNITED STATES PATENT OFFICE.

JOHN W. SMITH AND ELMER H. SMITH, OF MINNEAPOLIS, MINNESOTA.

.ACETYLENE BLOWPLPE.

and Emme H. SMrrn. Citizens of the United States, residents ofldinneaimlis. Hennepin county, Minnesota, have invented Certain new anduseful Improvements in Acetylene- Blovvpipes, ol which the following iso speciication.

(`)ur invention relates to hlo'n7 pipes lesigned for use with acetylene.flames for metal cutting,r and weldingfpnrpoeee,' and the object of theinvention is to simplify and improve the Constri'letion of the blow pipein general use to the end that the acetylene gue and oxygen will be moreuniformly und thoroughly mixed und the flare hack of theV lliune in theburner willhe positively prevented.

The. invention consists generally wirious eonstruetions andcombinations, all :ns hereinafter described and particularly pointed outin the Claim.

In the nreoinpanying drawings forming port ot this ieeiliezition, lgnre1 is a side 'View oic e, hlmv pipe enllorlying; our inten tion, 2 is :ilongitudinal servftionnl View through the burner of the lolowpipe. Figg.l is a traineverse sectional View on the line r4-1r of Fig'.

In the di'a\\.ir1g. EL' repreisents the handle of the blow pipe and 3sind 4. acetylene gus and. oxygen tunes ronneeted therewith :ind prfvided with regulating mime 5. These tubes eonnnuniente with :i ouituhleSource of gne; :md oxygen under presenze. t flhown. [it the opposite endof the handle 'pipes G find :ire prmidrd.y whih eoniniunifnte throughthe handle with the. tuberi, und ft end on those pipes the lvuner properinoi'lnted. l5' represente the liv-.ful oi'n the burner. into whioh onone side the pinne G :and 7 :ire tabbed. 1n o enfl of the e., Inhumlxnris foi-ined. provided 'with n r 11') which allows ;iei':;v the inner endoil' the when; foi-ined, Consisting of :in nleriorly i. outer portion 11and u Ifvylindr portion 1*.2 of lees diuu'etez than portion. .l1 plug.13 has 1 part ritter-indy threaded to engage the thrmuled well@r oi"the socket. and :i tip 1l is, form in the inner end of the plug. 'nllifhpro ots 'info the Specification, of Letters Patent.

Application filed Jennery 1o, 1913.

the pipe 7 with the Chamber 9. The inner end of the tip 14 is preferablytapered and the plug has e. central duet 16 formed therein.y extendinglengthwise thereof und terminating in n, small duct or lwhich extendsthrough to the end of thetip, concentric with the duct 16. A nozzle 18has a threaded nipple 19 formed on its inner end that is adapted toscrew into a socket in the head, the inner end of -the nipple 19`beingseated ngninet u shoulder 20 adjacent to the inner end ot the tip 14.provided with e central duct 21 which communientes with the duet 17, andthe inner portion of the nipple 1S) is Counter-sunk, forming beveled ordiverging Surfaces parallel with the tapered inner end of the tip 14:ind Sinteed therefrom to form a narrow annuler pags-alge around thetapered end of the tip when the nozzle 18 is screwed into its: sontagainst the shoulder 2U.

In the operation of the hlow pipe, the gas und oxygen will flow into thehead and the oxygen will be. disclmrged through a central oriliee. inthe nipple into the duct 21. The :rcetylene gee entering the annularchamber around the nipple will llow between the tip of the nipple andthe inner end of the noezle 18 and will .fonipletely encircle the streamof oxygen flowing through the nipple.y und the wells of the passagethrough which the acetylene is discharged will direct the gne toward thecenter of the duct 21, where it will Contact with the oxygen and minglewith it and he thoroughly mixed before reaching; the discharge end ofthe nozzle.

It will he not-ed that where the acetylene enters the .annuler paseugearound the oynilrifg'nl tip thzit the wells of the entrance due-1,.direct the ges against the surface of the tin and th@` los will hedeflected hy this suri'iee of the tip und Caused to flow around iln'onghthe :inruil-.ir p-.issage before entering the hiet of the. nozzle. 'Thestream of Oxy-- een will thurs he encircled by the gas and theeonver'ging walls of the end of the tip and the counter-nunk portion ofthe nozzle Will direct the gas inwardly and cause its hrnwngh nii ttnrewith the stream of oxygen. This :u .luier peseage mid the narrow passagearound the tip will also present a. tortuf path und eliminate to :ilarge degree the hanger of llore-. lr from the nozzle.

We elsiin es our invention :m-

Arf. eeetytfne blow pipe comprising a head having a chamber formed inone end thereof and a cap for said chamber, the bottom of said chamberhaving a socket therein, a plug fitting Within said socket andaccessible through said chamber and provided with a tip projecting intosaid socket and spaced from the walls thereof to form an annularpassage, said plug having a longitudinal duct therein extending from endto end and communicating at one end with Said chamber, the inner end ofsaid tip being beveledf a nozzle fitting Within the other end of saidhead and provided with a longitudinal duct concentric With the duct insaid tip, the inner end of said nozzle being countersunk and adapted toreceive the tapered end of said tip and uniformly spaced therefrom toform a flaring annular passage communieating with the passage aroundsaid tip, said head also having ducts in its side Walls coinmunicatingrespectively with. said chamber through the side walls thereof and withsaid annular passage, and oxygen and acetylenegas pipes mounted in saidhead and communicating respectively with said ducts, the acetylene gasentering said annular passa e being directed against the wall of saidtip and flowing around the same before passing to the inlet of saidnozzle, the Walls of said flaring passage around the tapered portion ofsaid tip directing the acetylene gas 1n- Ward! y into the jet of oxygenflowing through said tip.

ln witness whereof, I have hereunto Set my hand this 28th day ofDecember 1912. JOHN W. SMITH. ELMER H. SMITH. `Witnessesz i GENEVIEVE E.50m-:r EDWARD A. PAUL.

